InterviewSolution
Saved Bookmarks
InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
The incorrect statement(s) is/are :A. Mg cannot form complexesB. Be can form complexes due to a very small atomic sizeC. the first ionisation potential of Be is higher than that of MgD. Mg forms an alkaline hydroxide while Be forms amphoteric oxides |
| Answer» Correct Answer - A | |
| 202. |
Mixing which combination produces a gaseous product?A. Solid ammonium nitrate and solid calcium hydroxideB. Copper metal and 0.10 M hydrochloric acidC. Solutions of barium hydroxide and 0.10 M sulphuric acidD. Solutions of aluminum nitrate and sodium chloride |
|
Answer» Correct Answer - A In (a), `NH_(3)` is evolved |
|
| 203. |
Which of the following substance (s) is/are used in laboratory for drying purposes ?A. Anhydrous `P_(2)O_(5)`B. GraphiteC. Anhydrous `CaCl_(2)`D. `Na_(3)PO_(4)` |
| Answer» Correct Answer - A::C | |
| 204. |
A doctor by mistake administrate a dilute `Ba(NO_(3))_(2)` solution to a patient for radiographic investigations . Which of the following should be given as the best to prevent the absorption of soluble barium and subsequent barium poisoning?A. NaClB. `Na_(2)SO_(4)`C. `Na_(2)CO_(3)`D. `NH_(4)Cl` |
|
Answer» Correct Answer - 2 |
|
| 205. |
Salt `A+SrarrBoverset(BaCl_(2))rarr` White precipitate A is paramagnetic in nature and contains about 55% K. Thus, A isA. `K_(2)O`B. `K_(2)O_(2)`C. `KO_(2)`D. `K_(2)SO_(4)` |
|
Answer» Correct Answer - c Among the given oxides, only `KO_(2)`. i.e. potassium superoxide is paramagnetic in nature. This is because peroxide ion, `O_(2)^(-)` has three electron bonds which makes it paramagnetic and coloured. `underset("Oxide ion")O^(2-) underset("Peroxide ion").^(-)O-O^(-) underset("Superoxide ion")[O-=O]^(-)` Hence, A is `KO_(2)`. |
|
| 206. |
Which of the following compounds are paramagnetic in nature?A. `KO_(2)`B. `K_(2)O_(2)`C. `Na_(2)O_(2)`D. `RbO_(2)` |
| Answer» Correct Answer - A::D | |
| 207. |
Which of the following statements are correct for alkali metal compounds?(i)Superoxides are paramagnetic in nature.(ii) The basic strengths of hydroxides increase down the group.(iii) The conductivity of chlorides in their aqueous solutions decreases down the group.(iv) The basic nature of carbonates in aqueous solutions is due to cationic hydrolysis.A. (i),(ii)and (iii) onlyB. (i), and (ii), onlyC. (ii), (iii) and (iv)onlyD. (iii) and (iv) only |
|
Answer» Correct Answer - B |
|
| 208. |
The pair(s) of reagents that yield paramagnetic species is/areA. Na and excess of `NH_(3)`B. K and excess of `O_(2)`C. Cu and dilute `HNO_(3)`D. `O_(2)` and 2-ethylanthraquinol |
|
Answer» Correct Answer - A::B::C |
|
| 209. |
Which of the following compounds are paramagnetic in nature ?A. `KO_(2)`B. `K_(2)O_(2)`C. `Na_(2)O_(2)`D. `RbO_(2)` |
| Answer» Correct Answer - D | |
| 210. |
The reagent(s) used for softening the temporary hardness of water is (are):A. `Ca_(3)(PO_(4))_(2)`B. `Ca(OH)_(2)`C. `Na_(2) CO_(3)`D. `NaOCI` |
|
Answer» Correct Answer - B::C::D These are all correct options |
|
| 211. |
For the alkali metals, which of the following increases with increasing atomic number? (i) Aromic weight (ii) Electronegativity (iii) Hydratiojn energy of univalent ion (iv) Atomic radiusA. Both (i) & (ii) are correctB. only (iii) is correctC. Both (i) & (iv) are correctD. All are correct |
|
Answer» Correct Answer - C |
|
| 212. |
Which of the following increases in magnitude as the atomic number of alkali metals increases ?A. ElectronegativityB. First ionisation potentialC. Ionic radiusD. Melting point |
|
Answer» Correct Answer - C |
|
| 213. |
The increasing order of the density of alkali metals isA. `Li lt K lt Na lt Rb lt Cs `B. `Li lt Na lt K lt Rb lt Cs `C. `Cs lt Rb lt Na lt K lt Li `D. `Cs lt Rb lt K lt Na lt Li` |
|
Answer» Correct Answer - A Density of K is lower than that of Na . |
|
| 214. |
For the alkali metals, which of the following increases with increasing atomic number? (i) Aromic weight (ii) Electronegativity (iii) Hydratiojn energy of univalent ion (iv) Atomic radiusA. Both (i) & (ii) are correctB. only (iii) is correctC. Both (i) & (iv) are correctD. All are correct |
|
Answer» Correct Answer - C |
|
| 215. |
Which of the following sets of atomic numbers is of the alkali metals ?A. `2,10,18`B. `7,17,27`C. `15,320,30`D. `3,11,19` |
|
Answer» Correct Answer - D The atomic number of alkali metals are `3,11,19,37,55 and 87.` |
|
| 216. |
Assertion (A): Addtion of `NH_(4)OH` to an aqueous solution of `BaCl_(2)` in the presence of excess of `NH_(4)Cl` precipitates `Ba(OH)_(2)`. Reason (R ): `Ba(OH)_(2)` is insoluble in water.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If assertion is false but reason is true. |
|
Answer» Correct Answer - D Assertion is false but reason is true. |
|
| 217. |
Which of the following has density greater than water?A. `Li`B. `Na`C. `K`D. `Rb` |
|
Answer» Correct Answer - D `Li, Na,K` are lighter than water but `Rb` is heavier than water. |
|
| 218. |
Potassium superoxide `(KO_(2))` is used in space capsuled, submarined, and breathing masks, because it isA. diamagnetic in natureB. high melting compoundC. helpful in removing `CO_(2)` and producing `O_(2)`D. unstable compound. |
|
Answer» Correct Answer - C `KO_(2)` reacts with `CO_(2)` liberating `O_(2)` `4KO_(2)+2CO_(2) rarr 2K_(2)CO_(3)+2O_(2)` |
|
| 219. |
Statement-1: In Castner-kellner cell `Na^(+)` is reduced at mercury cathode. Statement-2: Standard reduction potential of hydrogen is higher than sodium.A. Statement-1 is True, Statement-2 is True. Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
| Answer» Correct Answer - B | |
| 220. |
`Cs^(+)` ions impart violet colour to Bunsen flame. This is due to the fact that the emitted radiations are ofA. High energyB. Low energyC. Longer wavelengthD. None of the three |
|
Answer» Correct Answer - B `Cs^(+)` ion emits radiations of low energy. |
|
| 221. |
`Cs^(+)` ions impart violet colour to Bunsen flame. This is due to the fact that the emitted radiations are ofA. high energyB. lower frequenciesC. longer wavelengthD. zero wave number |
|
Answer» Correct Answer - A Violet colour corresponds to high energy |
|
| 222. |
The alkali metals and their salts impart characteristic colour when kept in Bunsen flame . Regarding this which of the following statements is not correct .A. The colour is produced in oxidising flame .B. The colour is due to excitation and de excitation of outer electron .C. Production of colour by alkali metals when kept in flame can be utelized to determine the amount of alkali metal in a given sample .D. The colour is due to more electropositive character . |
|
Answer» Correct Answer - D |
|
| 223. |
`Cs^(+)` ions impart violet colour to Bunsen flame. This is due to the fact that the emitted radiations are ofA. High energyB. Low energyC. Longer wavelengthD. None of these |
|
Answer» Correct Answer - A `Cs^(+)` emits light of very high frequency or enerfy which corresponds to violet colour. |
|
| 224. |
(a) What is slaked lime ? (b) Beryllium and magnesium do not give colour to flame. Why? (c ) How is NaOH prepared hy castner-kellner method? |
|
Answer» Slaked lime is calcium hydroxide `Ca(OH)_(2)` and is formed by droping water on quick lime (CaO). This is known as slaking of lime. `CaO + H_(2)O to Ca(OH)_(2)` |
|
| 225. |
Assertion : Berylium does not impart any characteristic colour to the Bunsen flame. Reason : Due to its very high ionization energy, beryllium requires a large amount of energy for excitation of the electrons.A. Statement-1 is True, Statement-2 is True. Statement-2 is a correct explanation for Statement-1.B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1.C. Statement-1 is True, Statement-2 is False.D. Statement-1 is False, Statement-2 is True. |
| Answer» Correct Answer - A | |
| 226. |
Assertion : Berylium does not impart any characteristic colour to the Bunsen flame. Reason : Due to its very high ionization energy, beryllium requires a large amount of energy for excitation of the electrons.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If assertion is false but reason is true. |
|
Answer» Correct Answer - a The valence electrons in beryllium is too strongly bound to get excited by flame. Hence beryllium element does not impart any colour to the flame. |
|
| 227. |
Assertion (A) : Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide . Reason (R) : Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide .A. Both A and R are correct and R is the correct explanation of A.B. Both A and R are correct but R is not the correct explanation of A.C. Both A and R are not correctD. A is not correct but R is correct. |
|
Answer» Correct Answer - A Both A and R are correct and R is the corret explanation of A . |
|
| 228. |
Assertion (A): Lithium chloride is predominantly covalent compound. Reason (R ): electronegativity difference between Li and CI is small.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertionC. If assertion is true but reason is false.D. If assertion is false but reason is true. |
|
Answer» Correct Answer - c `LiCl` is predominantly covalent because small cation `(Li^(+))` causes more polarization of `Cl^(-)` to develop covalent nature. |
|
| 229. |
Name an element from group 2 which forms an amphoteric oxide and a water soluble sulphate. |
| Answer» Due to small size and somewhat high ionization enthalpy of Be , `Be(OH)_(2)` is amphoteric in nature , i.e., it reacts with both acids and base . Further due to small size , the hydration enthalpy of `Be^(2+)` ions is much higher than the lattice enthalpy of `BeSO_(4)` . As a result , `BeSO_(4)` is highly soluble in water . | |
| 230. |
Assertion . LiCl predominantly covalent compond . Reason . Electronegativity difference between Li and Cl is too small .A. If both assertion and reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is falseD. If both assertion and reason are false. |
|
Answer» Correct Answer - c Correct reason. Li being small polarizes the large `Cl^(-)` ion thereby making LiCl predominantly covalent . |
|
| 231. |
Assertion . The mobility of sodium ion is lower than that of potassium ion . Reason . The ionic mobilities depend upon the effective radius of the ion .A. If both assertion and reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is falseD. If both assertion and reason are false. |
|
Answer» Correct Answer - b Correct explanation . Because of smaller size , the extent of hydration of `Na^(+)` ions is higher than that of `K^(+)` ions . As a result , effective radius and hence the mass of hydrated `Na^(+)` ions is higher than that of `K^(+)` ions and , therefore , their mobility is lower than that of `K^(+)` ions . |
|
| 232. |
Assertion . K , Rb and Cs form superoxides . Reason . The stability of the superoxides increases from K to Cs due to decrease in lattice energy .A. If both assertion and reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is falseD. If both assertion and reason are false. |
|
Answer» Correct Answer - c Correct reason. Since for salts of larger anions , the lattice energy increases with increase in the size of the cation from `K^(+)` to `Cs^(+)` , therefore , the stability of their superoxides increases from K to Cs. |
|
| 233. |
Assertion . Sodium reacts with oxygen to form `Na_(2)O_(2)` but potassium reacts with oxygen to form `KO_(2)` Reason. Potassium is more reactive than sodium .A. If both assertion and reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is falseD. If both assertion and reason are false. |
|
Answer» Correct Answer - b Correct explanation . Due to bigger size of `K^(+)` than `Na^(+)`, it has a weak positive field around it which cannot prevent peroxide ion `(O_(2)^(2-))` to combine with another oxygen atom to form superoxide , `O_(2)^(-)` . |
|
| 234. |
The correct order of increasing thermal stability of `K_(2)CO_(3),MgCO_(3),CaCO_(3),` and `BeCO_(3)` isA. `BeCO_(3)ltMgCO_(3)ltCaCO_(3)ltK_(2)CO_(3)`B. `K_(2)CO_(3)ltMgCO_(3)ltCaCO_(3)ltBeCO_(3)`C. `MgCO_(3)ltBeCO_(3)ltCaCO_(3)ltK_(2)CO_(3)`D. `BeCO_(3)ltMgCO_(3)ltK_(2)CO_(3)ltCaCO_(3)` |
|
Answer» Correct Answer - a As the basicly of metal hydroxide increases down the group, thermal stability of their carbonates increases in the same order. As we know, group 1 compounds are more stable than group 2 compounds. Hence, correct order is `BeCO_(3)ltMgCO_(3)ltCaCO_(3)ltK_(2)CO_(3)` |
|
| 235. |
The correct order of increasing thermal stability of `K_(2)CO_(3) , MgCO_(3) , CaCO_(3)and BeCO_(3)` isA. `K_(2)CO_(3) lt MgCO_(3) lt CaCO_(3) lt BeCO_(3)`B. `BeCO_(3) lt MgCO_(3) lt K_(2)CO_(3) lt CaCO_(3)`C. `BeCO_(3) lt MgCO_(3) lt CaCO_(3) lt K_(2)CO_(3)`D. `MgCO_(3) lt BeCO_(3) lt CaCO_(3) lt K_(2)CO_(3)` |
|
Answer» Correct Answer - C Stability increases as the basic character of the corresponding hydroxide increases , i.e., option (c) is correct . |
|
| 236. |
The correct order of increasing thermal stability of `K_(2)CO_(3),MgCO_(3),CaCO_(3),` and `BeCO_(3)` isA. `I lt II lt III lt IV`B. `IV lt II lt III lt I`C. `IV lt II lt I lt III`D. `II lt IV lt III lt I` |
|
Answer» Correct Answer - B Is the correct answer |
|
| 237. |
Alkali metals have high oxidation potential and hence they behave as :A. oxidising agentsB. Lewis basesC. reducing agentsD. electrolytes |
|
Answer» Correct Answer - C Alkali metals behave as reducing agents. |
|
| 238. |
Fire extinguishers contain `H_(2)SO_(4) and `A. `NaHCO_(3) and na_(2)CO_(3)`B. `NaHCO_(3)` solutionC. `Na_(2) CO_(3)`D. `CaCO+_(3)` |
| Answer» Correct Answer - A | |
| 239. |
Amongst `LiCl, RbCl, BeCl_2` and `MgCl_2,` the compounds whith the greatrest and the least ionic character respecitely are :A. `MgCl_(2)" and "BeCl_(2)`B. `RbCl" and "BeCl_(2)`C. `RbCl" and "MgCl_(2)`D. `RbCl" and "LiCl` |
| Answer» Correct Answer - B | |
| 240. |
Amongst `LiCl, RbCl, BeCl_2` and `MgCl_2,` the compounds whith the greatrest and the least ionic character respecitely are :A. Licl and RbClB. `RbCl and BeCl_(2)`C. `RbCl and MgCl_(2)`D. `MgCl_(2) and BeCl_(2)` |
|
Answer» Correct Answer - B TbCl and `BeCl_(2).` Larger the action, more is the ionic character or smaller the cation greater is the covalent character. (Fajan rules) |
|
| 241. |
Amongst `LiCl, RbCl, BeCl_2` and `MgCl_2,` the compounds whith the greatrest and the least ionic character respecitely are :A. RbCl and LiClB. `MgCl_(2) and RbCl`C. `BeCl_(2) and RbCl`D. `BeCl_(2) and LiCl` |
|
Answer» Correct Answer - C `BeCl_(2)` and RbCl has the least and greatest ionic character respectively . |
|
| 242. |
Sokium forms `Na^(+)` and not `Na^(2)` becauseA. Sodium contains only one electron in outer most shellB. First ionisation potential is small and the difference in first and second ionisation potentials is very largeC. Radius of `Na_(2)` is much larger than `Na^(+)`D. None of these |
|
Answer» Correct Answer - B |
|
| 243. |
Most recative metal amont the following isA. KB. LiC. NaD. Cs |
|
Answer» Correct Answer - D |
|
| 244. |
The alkaline earth metal that does not lose its metallic lusture when exposed to air isA. BaB. MgC. BeD. Ca |
|
Answer» Correct Answer - 3 |
|
| 245. |
The aqueous solutions of lithium salts are poor conductor of electricity rather than other alkali metals because of:A. high ionisation energyB. high electronegativityC. lower ability of `Li^(+)` ion to polarize water moleculesD. higher degree of hydration of `Li^(+)` ions |
| Answer» Correct Answer - D | |
| 246. |
Which of the following metals cannot give flame test ?A. BeB. NaC. KD. Ca |
|
Answer» Correct Answer - 1 |
|
| 247. |
The metal extracted by electrolysis of its fused salt is:-A. `Fe`B. `Pb`C. `Cu`D. `Na` |
| Answer» Correct Answer - D | |
| 248. |
Assertion : Density is `Mg` is more than that of `Ca`. Reason : It is due to the presence of `3d-` orbital.A. Both assertion and reason are true and the reason is the correct explanation of the assertion.B. Both assertion and reason are true but reason is not the correct explanation of the assertionC. Assertion is true but reason is false.D. Assertion is false but reason is true. |
|
Answer» Correct Answer - c The density of alkaline earth metals decreases from `Be` to `Ca`. Alkaline earth metal have `ns^(2)` configuration. |
|
| 249. |
`A` and `B` are two salts. A with dilute `HCl` and `B` with con. `H_(2)SO_(4)` react to give reddish brown vapours, hence `A` and `B` respectively are :A. `NaBr, NaNO_(3)`B. `NaNO_(3), NaBr`C. `NaBr, NaNO_(2)`D. `NaNO_(2),NaBr` |
|
Answer» Correct Answer - D `NaNO_(2)` gives `NO_(2)(`brown`)` with dil. Acids whereas `NaBr` and `NaNO_(2)` both give brown vapours `Br_(2)` and `NO_(2)` respectively with conc. Acids. |
|
| 250. |
The alkali metal which can emit its outermost electron under the influence of even candle light isA. LiB. RbC. KD. Cs |
|
Answer» Correct Answer - D Cs because of its low IE emits electron under the influence of even candle light. |
|